メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.471933858057 42.9682173352996, 141.470318511382 42.967155700248, 141.47079982054 42.966882507682, 141.470942049727 42.9670855324376, 141.471721543629 42.9661338476905, 141.472036711605 42.9656986042704, 141.472068772156 42.9657228036565, 141.47310598649 42.9667617859085, 141.471933858057 42.9682173352996)) ^^http://www.opengis.net/ont/geosparql#wktLiteral